Riveting tool



Feb. 13, 1951 N, R, ANDERSON 2,541,455

RIVETING TOOL Filed May 27, 1946 i A; 2 I4 f7; J 5

Patented Feb. 13, 1951 RIVETING TOOL Neville Rupert Anderson, Edgeclif, near Sydney, New South Wales, Australia Application May 27, 1946, Serial No. 672,519 In Australia May 30, 1945 2 Claims.

The present invention relates to riveting or like forming tools and provides a mandrel adapted to be rotated by any suitable means, such as for instance, an electric motor or drilling machine, the outer or free end of the mandrel containing a race having rolling members in the form of balls or rollers retained in place by a sleeve or cage.

Preferably three balls only are used so that, when the free end of the rotating mandrel is pressed against the headless end of a rivet, the balls run around the periphery of the said end, the combined thrust and rotation of the mandrel causing the balls to peen or spin out the rivet metal. The rivet head thus formed contains the frustrum of a circular cone having concave sides corresponding to the path of the balls, and, under some circumstances, the top of the rivet head may be drawn out with a hollow in the centre.

In the accompanying drawings which illustrate several forms of the invention:

Fig. 1 is a longitudinal sectional elevation of one form of tool.

Fig. 2 is an inverted plan on the line A-A.

Fig. 3 is a longitudinal sectional elevation of another form of tool.

Fig. 4 represents similar sectional elevations of untreated and treated rivets.

Fig. 5 is a longitudinal sectional elevation of portion of another form of tool.

Referring to Fig. 1, the mandrel I has an upper portion 2 adapted, for instance, to be gripped by the jaws of a drilling machine chuck 2a. The free end 3 has a ball race 4 formed therein to accommodate three balls 5, the said balls being retained in place by a sleeve 6, which is secured in position on the mandrel I by an expanding ring 1.

Referring to Fig. 4, when the rotating mandrel I is pressed against the headless end 8 of a rivet 9, the balls run around the periphery I0 of the said end, the combined thrust and rotation of the mandrel causing the balls to peen or spin out the metal, as for instance, shown by the rivet head II.

A hole I2 is provided in the free end 3 of the tool to accommodate surplus metal I3, which may be drawn out in the form of a hollow point.

When the lip I4 of the sleeve 6 extends a preselected distance below the balls 5, as in Fig. 1, the said lip may contact the work I6, so that the sleeve 6 ceases to rotate and thus gives a visible indication to the operator when the desired size of rivet head II has been formed.

Referring to Fig. 3. the balls in this form of tool 2 project below the level of the lip I4, so that the periphery ofthe rivet I0 may be blended into the work I6, as is more especially desirable when forming countersunk rivet heads IIa, see Fig. 4.

In Fig. 3, the race 4a is shown as a separate renewable part and the sleeve 6a is secured in position on the mandrel I by a pin la. It will be understood that, instead'of being secured by a pin 1a, the sleeve 6a may be left free to move relatively to the mandrel I.

In Fig. 5 the balls are shown replaced by rollers 5a accommodated in a race 4b and retained in place by a sleeve 6b.

I claim:

1. A riveting tool comprising a mandrel clampable at one end by a rotatable chuck or the like, and having in its other end an open race, riveting balls in said race, and on said mandrel a sleeve surrounding said balls and having an inwardly projecting circumferential lip retaining said balls in said race, said sleeve being rotatable with respect to said mandrel.

2. A riveting tool comprising a mandrel clamp` able at one end by a rotatable chuck or the like, and having in its other end an open race, riveting balls in said race, and on said mandrel a sleeve surrounding said balls and having an inwardly projecting circumferential lip retaining said balls in said race, there being in the body of said mandrel a cavity open to said race to receive a reduced end of a rivet.

NEVILLE RUPERT ANDERSON.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 921,739 Rieske May 18, 1909 1,089,281 Snodgrass Mar. 3, 1914 1,343,571 Ludwig June 15, 1920 1,440,527 Brinkman Jan. 2, 1923 1,500,523 Osteman July 8, 1924 1,517,079 Langton Nov. 25, 1924 1,907,038 Burns May 2, 1933 1,957,387 Cassady May l, 1934 2,124,961 Brinkman July 26, 1938 2,332,935 Schlack Oct. 26, 1943 2,395,751 Newcomber Feb. 26, 1946 FOREIGN PATENTS Number Country Date 495,585 Germany Apr. 9, 1930 

